Photographer extraordinaire Don Pettit is about to return to Earth following a seven-month stay aboard the space station. Take a moment to enjoy his best work.

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...

The all-women crew landed safely, but then Jeff Bezos nearly faceplanted and Wendy's tweeted jokes at Katy Perry.

Astronomers may have uncovered a hidden population of galaxies that could rewrite what we know about the universe's evolution ...